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A certain piece of electrical machinery has exactly three control levers-left (L), center (C), and right (R)-each with positions of up or down. The machine is able to operate if and only if the operator has placed them in one of the following four configurations.
Consider the statement, The one and only means of X is Y. Select the options for X and for Y such that the statement, if true, most clearly provides a possible explanation of the above facts.
Powering on the machine
Powering off the machine
Placing the L and C levers in the same position
Placing the L and R levers in different positions
Placing the C and R levers in the same position
Placing both the C and the R levers in the down position
| Text from Passage | Analysis |
|---|---|
| "A certain piece of electrical machinery has exactly three control levers-left (L), center (C), and right (R)" |
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| "each with positions of up or down" |
|
| "The machine is able to operate if and only if..." |
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| Four configurations listed |
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Let me map out the four operating configurations:
Critical Discovery: In ALL four operating configurations, the C and R levers are always in the same position!
We need to complete: "The one and only means of X is Y"
Since C and R being in the same position is:
Then:
For X (what we want to achieve):
For Y (the means to achieve X):
Part 1 (X): "Powering on the machine"
Part 2 (Y): "Placing the C and R levers in the same position"